Allocating Drive Letters for the Epson Workforce 845

When I was setting up this printer, it grabbed a drive letter -- I am assuming for a memory card -- which is showing as empty in My Computer.

Because I needed that letter for other applications, I deleted the printer, assigned the drive letters as needed, and then re-installed the printer. As expected, it took the first available letter, which was OK since I knew ahead of time.

But, is/was there a way to "un-assign" the letter the printer initially grabbed and then re-assign it? I saw nothing when I looked, and haven't heard back from Epson as yet.